The Feast of the Transfiguration of the Lord became widespread in the West in the 11th century and was introduced into the Roman calendar in 1457 to commemorate the victory over Islam in Belgrade. Before that, the Transfiguration of the Lord was celebrated in the Syrian, Byzantine, and Coptic rites. The Transfiguration foretells the glory of the Lord as God, and His Ascension into heaven. It anticipates the glory of heaven, where we shall see God face to face. Through grace, we already share in the divine promise of eternal life.